Tall, skinny, flat-chested, and leggy: What type of clothes suit me?

In simpler terms, I'm pretty lanky. Age: Mid teens - so my measurements are pretty set. Their still a possibility of course *shrug*Height: 5'8"Bust: 36a (my hips are wider than my bust)The problem is I don't know how to dress my frame without it being ultra baggy. I usually just keep to jeans, t-shirts, and sweater because I have no clue what I'm doing. Does anybody have a similar shape? Or know what I should where?Whatever advise you have is greatly appreciated. Thanks!